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Simplifying
-9r2 + -6r2 + 10r2 = 0
Combine like terms: -9r2 + -6r2 = -15r2
-15r2 + 10r2 = 0
Combine like terms: -15r2 + 10r2 = -5r2
-5r2 = 0
Solving
-5r2 = 0
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Divide each side by '-5'.
r2 = 0
Simplifying
r2 = 0
Take the square root of each side:
r = {0}
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